UTLS Tracer Transport in WACCM

Large-scale tracer transport in the upper troposphere and lower stratosphere (UTLS) is investigated using simulations of the Whole Atmosphere Community Climate Model (WACCM) over the period 1955-2099. The analyses are based on e90, an artificial passive tracer with constant emissions and atmospheric loss rates. The separate contributions of advection by the residual circulation, eddy mixing, and subgrid convection to total transport are explicitly evaluated. The results highlight distinct large-scale transport regimes in the tropics, characterized by efficient vertical tracer transport, and the extratropics, dominated by isentropic mixing.

Publication:

Abalos, M., W. J. Randel, D. E. Kinnison, and R. R. Garcia, 2017: Using the artificial tracer e90 to examine present and future UTLS tracer transport in WACCM. Journal of the Atmospheric Sciences, 74, 3383-3403, doi:10.1175/JAS-D-17-0135.1.

Image: 
https://commons.wikimedia.org/wiki/File:Overshooting_Top.jpg
Short title: 
Paper by Marta Abalos, Bill Randel, Doug Kinnison, and Rolando Garcia
Source: 
ACOM
Audience: 
ACOM

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ACOM | Atmospheric Chemistry Observations & Modeling